good size carb for a mild 340?

i have a 70 340 duster that has a 750 holley dp on it, torker intake, it has a very lopey cam, but not sure of the specs. 4 speed trans.
i am wondering if the 750 is too big for the engine? i have just installed a blaster coil, msd 6al, new fuel pump and guages. but my carb leaks fuel. so now it is time to get another. any suggestions.

i will / do drive this car every single day in the summer........ well, let me rephrase that. i will drive it everyday that i am able to without snow being on the ground.lol so please take that into consideration. there are no 1/4 tracks near me, so i am not worrying about racing it
i want it to be trouble free and fast.lol
Author: admin